June 8，By Graduate School of Shandong University、Sponsored by the Postgraduate Affairs Department of the Party Committee，The 11th "Haiyou" doctoral academic forum hosted by the School of Electrical Engineering (804 in total) was held as scheduled in the lecture hall of the Electric Power Building on Qianfoshan Campus，This forum invites 2019 doctoral candidate Xing Zezhi、Li Yahui is the guest speaker，Song Sili, Deputy Secretary of the Party Committee of School of Electrical Engineering, Shandong University、Professor Li Kejun attended the forum as a guest commentator，President Sun Fengbin of the College Graduate Student Union。

The beginning of the forum，Xing Zezhi titled "Research on key basic issues of electromagnetic vibration of permanent magnet synchronous motor"，Basic personal situation、Topic Introduction、Report on the main achievements and summary during the doctoral period in four aspects。He pointed out，Currently due to the electromagnetic vibration of variable frequency power supply permanent magnet synchronous motor，Making electromagnetic vibration problems increasingly complex，There are obvious shortcomings in existing analysis methods。Therefore，During his Ph.D., he proposed a fast and accurate calculation method for electromagnetic force waves that combines the subdomain method and the magnetomotive force-permeability method、A fast and accurate calculation method for the natural frequency of the stator based on the energy method and the use of the linear superposition principle to obtain the vibration response of the stator under the action of electromagnetic forces at different frequencies to solve the problem of electromagnetic vibration，Achieved a series of outstanding results。

Li Yahui’s topic is “Multiple source-load harmonic characteristics and modeling analysis of new power systems”，From research background、Analysis and modeling of harmonic coupling generation characteristics、Multiple source-charge characteristic analysis and harmonic model construction、The harmonic characteristics and impact analysis, summary and outlook are reported in five parts。Li Yahui talked about，Harmonic mutual coupling，It is necessary to consider various types of equipment structures、Control Differences，Construct a form-consistent multi-type harmonic source analysis model。He also read from the abstract、Introduction to paper writing and journals from five aspects including introduction and content、Multi-angle comparison of conference papers and patents，Encourage students to lay a solid foundation，Advance despite difficulties，Perseverance。

Li Kejun put forward guiding suggestions to the students at the scene based on the guest speaker’s report，He pointed out that he hoped the students would devote themselves to scientific research、Make good life plans、Be brave enough to face setbacks in the scientific research process，“If you do it, you will get it”。The students present also asked the two senior brothers about their confusion during graduate school，Both parties had in-depth exchanges and interactions。

Song Sili makes summary comments。He pointed out that students must have perseverance on their academic path，Young people must have the spirit of “asking for trouble”，And stay confident，I hope more electrical students will follow the example of the guest speakers，Strive to be an excellent researcher。

To this point，This issue of "Haiyou" doctoral academic forum has concluded successfully，The guests took the stage to take a group photo。This "Haiyou" doctoral exchange and sharing forum provides a platform for current students to communicate，Sharing academic research through outstanding doctoral students，Inspire college students to stick to their original academic aspirations，Persistence，Making outstanding contributions to the national electric power industry。

Introduction to the speaker:

Xing Zezhi，2019 doctoral candidate from School of Electrical Engineering, Shandong University，Study under Professor Wang Xiuhe。The research direction is electromagnetic vibration of permanent magnet synchronous motor。By exploring the mechanism of electromagnetic vibration in motors，Construct a fast and accurate calculation system for electromagnetic vibration of permanent magnet synchronous motor，Key technology to break through the electromagnetic vibration and noise suppression of permanent magnet synchronous motor。Currently the first author in IEEE TIE、TTE、Published more than 10 SCI papers in high-level journals such as TEC，The cumulative impact factor of one paper exceeds 40。Received Principal’s Scholarship、National Scholarship、Xue Yusheng Scholarship、Kehui Scholarship、Shandong University Outstanding Graduate Student Model and other honors and titles。

Li Yahui，2019 doctoral candidate from School of Electrical Engineering, Shandong University，Study under Professor Sun Yuanyuan。The main research direction is power system power quality modeling and analysis，Published more than 20 papers in SCI/EI journals，More than 10 authorized invention patents，Participated in many projects of the National Natural Science Foundation of China during my PhD studies，Won the National Scholarship for Doctoral Students、Shandong University Outstanding Graduate Student and other honors。